Sir Peter Hannay Bailey Tapsell was a British Conservative Party politician and Member of Parliament (MP) for Louth and Horncastle. He served in the House of Commons continuously from 1966 until 2015, and was also previously an MP from 1959 to 1964. He was Father of the House between 2010 and 2015. With a total parliamentary service of 54 years, he is one of the longest-serving MPs in British history.

The father of the House is a title that is bestowed on the senior member of the House of Commons who has the longest continuous service. If two or more members have the same length of current uninterrupted service, then whoever was sworn in earliest, as listed in Hansard, is named as Father of the House.